{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["DNA", "cell line", "protein", "RNA", "cell type"], "input": "The molecular mechanisms underlying the sustained nuclear translocation of NF-kappa B observed in U937 monocytic cells chronically infected with human immunodeficiency virus ( HIV ) were studied."}
{"DNA": [], "cell line": ["U937 monocytic cells"], "protein": ["NF-kappa B"], "RNA": [], "cell type": ["monocytic cells"]}